首页 > 资讯 > 其他综合 > 正文

SSM小白教程之CURD

18-05-16 来源：[db:作者]

收藏我要投稿

写给初级小伙伴和自己，持续更新中，大神绕行，开撸

R：retrieve(查询)

要点：1.分页，使用PageHelper插件

2.数据校验，前段使用jquery，后端使用JSR303

3.ajax技术

4.所有请求使用Restful风格（GET 查询， POST 新增 , PUT 修改， DELETE 删除）

框架：

基础：SSM

数据库：mySql

前端css与html：bootstrap

用到MyBatis Generator(逆向工程)，用maven管理依赖的jar包

首先快速建立一个maven工程

src中的webapp会是空的，不应该为空，原因，csdn博主说是构建maven时，使用了默认的jdk1.5，按照该博主说法我没解决

对应解决办法：

取消选中，关闭，再打开，选中

配置路径 src/main/webapp

在pom.xml 中导入依赖的jar

	<!--引入项目依赖的jar包 -->
	<dependencies>
		<!--引入pageHelper分页插件 -->
		<dependency>
			<groupId>com.github.pagehelper</groupId>
			<artifactId>pagehelper</artifactId>
			<version>5.0.0</version>
		</dependency>

		<!-- MBG -->
		<!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
		<dependency>
			<groupId>org.mybatis.generator</groupId>
			<artifactId>mybatis-generator-core</artifactId>
			<version>1.3.5</version>
		</dependency>

	      

                  <!-- SpringMVC、Spring -->

	        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->

                <dependency>

			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency>


		<!-- 返回json字符串的支持 -->
		<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.8.8</version>
		</dependency>


		<!--JSR303数据校验支持；tomcat7及以上的服务器， 
		tomcat7以下的服务器：el表达式。额外给服务器的lib包中替换新的标准的el
		-->
		<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-validator</artifactId>
			<version>5.4.1.Final</version>
		</dependency>




		<!-- Spring-Jdbc -->
		<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency>


		<!--Spring-test -->
		<!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency>




		<!-- Spring面向切面编程 -->
		<!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
			<version>4.3.7.RELEASE</version>
		</dependency>


		<!--MyBatis -->
		<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.4.2</version>
		</dependency>
		<!-- MyBatis整合Spring的适配包 -->
		<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.3.1</version>
		</dependency>


		<!-- 数据库连接池、驱动 -->
		<!-- https://mvnrepository.com/artifact/c3p0/c3p0 -->
		<dependency>
			<groupId>c3p0</groupId>
			<artifactId>c3p0</artifactId>
			<version>0.9.1</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.41</version>
		</dependency>
		<!-- （jstl，servlet-api，junit） -->
		<!-- https://mvnrepository.com/artifact/jstl/jstl -->
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>


		<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.0.1</version>
			<scope>provided</scope>
		</dependency>




		<!-- junit -->
		<!-- https://mvnrepository.com/artifact/junit/junit -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
		</dependency>
	</dependencies>

注意一下：

如果不引入这个servlet-api，开发时jsp页面会报错，但是服务器又有这个包，红框内容表示，打包时会提出掉，不放到服务器上

　　引入前端UI框架bootstrap

　　URL： http://v3.bootcss.com/

　　先下载，然后复制粘贴

　　才发现，每张图片都被打了水印了，哈哈，防盗图吗?

　　如果开发联网就不用导入，直接在jsp页面去引用就行，针对无网开发需要将bootstrap和jquery引入，关于后续部署服务器是否需要使用项目中的bootstrap和jquery，

现在不懂

　　这文章越写越乱，只能自己用了

　　配置web.xml

<!--1、启动Spring的容器  -->
			<!-- needed for ContextLoaderListener -->
			<context-param>
				<param-name>contextConfigLocation</param-name>
				<param-value>classpath:applicationContext.xml</param-value>
			</context-param>
		
			<!-- Bootstraps the root web application context before servlet initialization -->
			<listener>
				<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
			</listener>
			
			<!--2、springmvc的前端控制器，拦截所有请求  -->
			<!-- The front controller of this Spring Web application, responsible for handling all application requests -->
			<servlet>
				<servlet-name>dispatcherServlet</servlet-name>
				<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
				<load-on-startup>1</load-on-startup>
			</servlet>
		
			<!-- Map all requests to the DispatcherServlet for handling -->
			<servlet-mapping>
				<servlet-name>dispatcherServlet</servlet-name>
				<url-pattern>/</url-pattern>
			</servlet-mapping>
			
			<!-- 3、字符编码过滤器，一定要放在所有过滤器之前 -->
			<filter>
				<filter-name>CharacterEncodingFilter</filter-name>
				<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
				<init-param>
					<param-name>encoding</param-name>
					<param-value>utf-8</param-value>
				</init-param>
				<init-param>
					<param-name>forceRequestEncoding</param-name>
					<param-value>true</param-value>
				</init-param>
				<init-param>
					<param-name>forceResponseEncoding</param-name>
					<param-value>true</param-value>
				</init-param>
			</filter>
			<filter-mapping>
				<filter-name>CharacterEncodingFilter</filter-name>
				<url-pattern>/*</url-pattern>
			</filter-mapping>
			
			<!-- 4、使用Rest风格的URI，将页面普通的post请求转为指定的delete或者put请求 -->
			<filter>
				<filter-name>HiddenHttpMethodFilter</filter-name>
				<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
			</filter>
			<filter-mapping>
				<filter-name>HiddenHttpMethodFilter</filter-name>
				<url-pattern>/*</url-pattern>
			</filter-mapping>
			<filter>
				<filter-name>HttpPutFormContentFilter</filter-name>
				<filter-class>org.springframework.web.filter.HttpPutFormContentFilter</filter-class>
			</filter>
			<filter-mapping>
				<filter-name>HttpPutFormContentFilter</filter-name>
				<url-pattern>/*</url-pattern>

			</filter-mapping>

　　创建并配置springmvc的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">


		<!--SpringMVC的配置文件，包含网站跳转逻辑的控制，配置  -->
		<context:component-scan base-package="com.liyan" use-default-filters="false">
			<!--只扫描控制器。  -->
			<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
		</context:component-scan>
		
		<!--配置视图解析器，方便页面返回  -->
		<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			<property name="prefix" value="/WEB-INF/views/"></property>
			<property name="suffix" value=".jsp"></property>
		</bean>
		
		<!--两个标准配置  -->
		<!-- 将springmvc不能处理的请求交给tomcat -->
		<mvc:default-servlet-handler/>
		<!-- 能支持springmvc更高级的一些功能，JSR303校验，快捷的ajax...映射动态请求 -->
		<mvc:annotation-driven/>
		

</beans>

　　创建并配置spring的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">


			<context:component-scan base-package="com.liyan">
				<context:exclude-filter type="annotation"
					expression="org.springframework.stereotype.Controller" />
			</context:component-scan>
		
			<!-- Spring的配置文件，这里主要配置和业务逻辑有关的 -->
			<!--=================== 数据源，事务控制，xxx ================-->
			<context:property-placeholder location="classpath:db.properties" />
			<bean id="pooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
				<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
				<property name="driverClass" value="${jdbc.driverClass}"></property>
				<property name="user" value="${jdbc.user}"></property>
				<property name="password" value="${jdbc.password}"></property>
			</bean>
		
			<!--================== 配置和MyBatis的整合=============== -->
			<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
				<!-- 指定mybatis全局配置文件的位置 -->
				<property name="configLocation" value="classpath:mybatis-config.xml"></property>
				<property name="dataSource" ref="pooledDataSource"></property>
				<!-- 指定mybatis，mapper文件的位置 -->
				<property name="mapperLocations" value="classpath:mapper/*.xml"></property>
			</bean>
		
			<!-- 配置扫描器，将mybatis接口的实现加入到ioc容器中 -->
			<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
				<!--扫描所有dao接口的实现，加入到ioc容器中 -->
				<property name="basePackage" value="com.liyan.crud.dao"></property>
			</bean>
			
			<!-- 配置一个可以执行批量的sqlSession -->
			<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
				<constructor-arg name="sqlSessionFactory" ref="sqlSessionFactory"></constructor-arg>
				<constructor-arg name="executorType" value="BATCH"></constructor-arg>
			</bean>
			<!--=============================================  -->
		
			<!-- ===============事务控制的配置 ================-->
			<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
				<!--控制住数据源  -->
				<property name="dataSource" ref="pooledDataSource"></property>
			</bean>
			<!--开启基于注解的事务，使用xml配置形式的事务（主要的都是使用配置式）  -->
			<aop:config>
				<!-- 切入点表达式 -->
				<aop:pointcut expression="execution(* com.atguigu.crud.service..*(..))" id="txPoint"/>
				<!-- 配置事务增强 -->
				<aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"/>
			</aop:config>
			
			<!--配置事务增强，事务如何切入  -->
			<tx:advice id="txAdvice" transaction-manager="transactionManager">
				<tx:attributes>
					<!-- 所有方法都是事务方法 -->
					<tx:method name="*"/>
					<!--以get开始的所有方法  -->
					<tx:method name="get*" read-only="true"/>
				</tx:attributes>
			</tx:advice>
			
			<!-- Spring配置文件的核心点（数据源、与mybatis的整合，事务控制） -->

</beans>

　　创建并配置db.properties文件

　　jdbc.jdbcUrl=jdbc:mysql://localhost:3306/ssm_crud

　　jdbc.driverClass=com.mysql.jdbc.Driver

　　jdbc.user=root

　　jdbc.password=root

　　再配置mybatis-config.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://www.mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<!-- 驼峰命名规则 -->
	<settings>
		<setting name="mapUnderscoreToCamelCase" value="true"/>
	</settings>
	<!-- 别名 -->
	<typeAliases>
		<package name="com.liyan.crud.bean"/>
	</typeAliases>
	
	<plugins>
		<plugin interceptor="com.github.pagehelper.PageInterceptor">
			<!--分页参数合理化  -->
			<property name="reasonable" value="true"/>
		</plugin>
	</plugins>


</configuration>

　　使用navicat创建两张表，

　　创建并配置mybatis generator的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
  "http://www.mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>


	<context id="DB2Tables" targetRuntime="MyBatis3">
		<commentGenerator>
			<property name="suppressAllComments" value="true" />
		</commentGenerator>
		
		<!-- 配置数据库连接 -->
		<jdbcConnection driverClass="com.mysql.jdbc.Driver"
			connectionURL="jdbc:mysql://localhost:3306/ssm_crud" 
			userId="root"
			password="root">
		</jdbcConnection>

		<javaTypeResolver>
			<property name="forceBigDecimals" value="false" />
		</javaTypeResolver>

		<!-- 指定javaBean生成的位置 -->
		<javaModelGenerator targetPackage="com.liyan.crud.bean"
			targetProject=".\src\main\java">
			<property name="enableSubPackages" value="true" />
			<property name="trimStrings" value="true" />
		</javaModelGenerator>


		<!--指定sql映射文件生成的位置 -->
		<sqlMapGenerator targetPackage="mapper" targetProject=".\src\main\resources">
			<property name="enableSubPackages" value="true" />
		</sqlMapGenerator>

		<!-- 指定dao接口生成的位置，mapper接口 -->
		<javaClientGenerator type="XMLMAPPER"
			targetPackage="com.liyan.crud.dao" targetProject=".\src\main\java">
			<property name="enableSubPackages" value="true" />
		</javaClientGenerator>

		<!-- table指定每个表的生成策略  domainObjectName是javaBean的名称-->
		<table tableName="tbl_emp" domainObjectName="Employee"></table>
		<table tableName="tbl_dept" domainObjectName="Department"></table>
	</context>

</generatorConfiguration>

　　编写mybatis逆向工程代码

public static void main(String[] args) throws Exception {
		
		   List<String> warnings = new ArrayList<String>();
		   boolean overwrite = true;
		   File configFile = new File("mbg.xml");
		   ConfigurationParser cp = new ConfigurationParser(warnings);
		   Configuration config = cp.parseConfiguration(configFile);
		   DefaultShellCallback callback = new DefaultShellCallback(overwrite);
		   MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
		   myBatisGenerator.generate(null);

	}

　　运行后就会生成相应的bean和mapper接口

　　越写越乱

　　在EmployeerMapper.java中添加多表查询的接口，mybatis逆向工程生成的查询都是单表查询

　　List selectByExampleWithDept(EmployeeExample example);

　　Employee selectByPrimaryKeyWithDept(Integer empId);

　　添加新的属性

点击复制链接与好友分享!回本站首页